Bridge construction.



PATENTED Armle, 190;

s. w. HILL.

BRIDGE consriwonom AIIPILIILR'IBIHJI!" FILED AUG. 20, 1902. EBHBWED FEB. 23, 1904.

2 SHEETS-SHEET 1.

N0 IQDEL.

PATENTED APR. 19, 1904. S. W. HILL. BRIDGE CONSTRUCTION. nrmu non nun we.

20, 19021 RENEWED FEB. 23, 1904.

2 SHEETS-SHEET 2.

N0 MODEL.

all I II I, I I

I al /1,1

I II I 1 I I Ill I ll/I O O O O 0 O O UNITED STATES Patented. April 19, 1904.

PATENT OFFICE.

SAMUEL w. HILL, or Ross TowNsmr, ALLEGHENY COUNTY,

. PENNSYLVANIA.

l BRIDGE VCONSTRUQTIONQ SPECIFICATION forming part of Letters lPatent No. 757,552, dated. April 19, 1904.

Application filed August 20, 1902. Renewed February 23,1904- Serial No. 194,880. (No model.)

To all whom, it inayconcerni Be it known that I, SAMUEL W. HILL, a citizen of the United States of America, residing in Ross township, in the countyofAllegheny and State of Pennsylvania, have invented certain new and useful Improvements in Bridge Construction, of which the following is a specification, reference being had therein to the ac companying drawings.

This invention relates to certain new and useful improvements in bridge construction, and relates more particularly to that class wherein a structural iron or steel frame is employed in connection with a filling of cement concrete.

The present invention has for its object to provide a bridge construction that will take the place of stone arch-bridges, equaling the latter in strength and durability and materially reducing the cost of'constructionr furthermore, to provide a new and novel formof construction that will elfectually overcome the unsafe conditions of a steel bridge, which becomes brittle when exposed to a low temperature and also subject to expansion and" contraction due to the differences in temperature.

The invention further consists in the novel construction, combination, and arrangement of the parts comprising the structural steel or iron frame, all of which will be hereinafter more particularly described, and specifically pointed out in the claims.

In describing the invention in detail reference is had to the accompanying drawings, formingapart of this specification, and where: in like numerals of reference indicate like parts throughout the different views, in which Figure 1 is a side elevation of an arched bridge, partly in vertical section, showing my improved construction. Fig. 2 is a transverse sectional view partly broken away. Fig. 3 is a longitudinal vertical sectional view of the base, which rests upon a suitable foundation. Fig. 4 is a fragmentary top plan view of one of the girders and tie plates. Fig. 5 is a similar view of one of the tie-plates. Fig. 6 is a side view thereof. Fig. 7 is 'an end view of the same. Fig.8 is a side view showing the manner of connecting the tie-plates together. Fig. 9 is an enlarged vertical sectional view of one of the girders.

In the drawings, 1 represents a'suitable foundation, in which are anchored built-up structural steel or iron girders. These girders are formed of arched channel-bars 2. the

flanges of which extend in opposite directions.

These channel-bars are reinforced interiorlyf by angle-bars 3 and are suitably connected t9- gether. To the under faceof the said channel-bars'and angle-irons, upon which the girders are secured, is an arched plate lgwhich plate is securely riveted to the lower or. inner flanges of thechannel-bars 2. The arched plate extends slightly beyond the sides thereof and'is adapted to receive the channel-bar tie-plates 5, which are riveted together at their to said flanges and serve the purpose of the top chord, thereby leaving the built-up girders open to receive the concrete and also obtain an equal distribution of the stress upon the girders;furthermore, permitting the girder to be securely embedded in the concrete, thereby excluding the same from the atmosphere.

The supporting or base plate 7 has secured thereto the lowermost flange of the channelbar tie-plates, said base-plate secured to the stone, concrete, or other suitable foundation by means of anchor-bolts. Angle-irons 8 are also secured to the channel-bars 2,:which give strength and rigidity to the structure. The cement concrete is indicated by the referencenumeral 9 and forms-the body portion of the bridge, said cement concrete having formed thereon earth filling 10, and 11 indicates the ballast arranged upon the earth filling. 12 indicates the cross-ties of the rails.

It will be particularly observed that the entire strain upon the girders is edgewise, extending longitudinally, thereby greatly increasing their tensile strength when embedded in the concrete. It will also be noted that the built-up girders may be formed of one, two,

or more channel-bars suitably secured to-.

arched channel-bars and angle-irons forming girders, arched plates secured to the under face ofsaid girders, channel-bar tie-plates secured at their flanges arranged between said girders, and a filling of concrete embedding and surrounding said girders, substantially as described.

2., Inian arched bridge, the combinationof girders formed ofchannel-bars and an gle-irons securelyrivetedtogether,arched platessecured to the under face of said channeland angle irons, channel-bar tie-plate secured to said arched plates, braces extending and connecting the upper flanges of said channel-bars, and

a filling of cement concrete embedding said channel and angle irons, substantially as described.

3. In an arched bridge, the combinationof arched channel-bars, the flanges of which extend in opposite directions, arched angle-irons interiorly reinforcing said steel bars, arched with a filling of cement concrete and earth,

substantially as described. I

4. In a bridge, the combination with the arched channel-bars, of interiorly-arranged angle-bars secured to the said channel-bars, arched plates engaging and being secured to the under facesof the said channel-bars, and a filling of cement concrete.

5. The combination with the arched beams, of arched plates secured to the lower faces of the said beams,channel-bar tie-plates arranged between the said arched beams, said tie-plates being secured to the said arched plates, and a filling of concrete or the like. a V

6. The combination with the beams,of plates secured to the lower faces of the said beams, and extending beyond the edges thereof, tieplates resting upon and secured to the extended portions of the said arched plates, and a fill- I ing, substantially as described.

SAMUEL W. HILL. Witnesses H. O. EVERT,

JOHN NoLAND. 

